Alarm clock



FIG. 1 is perspective view of an alarm clock showing my design;

FIG. 2 is a front view;

FIG. 3 is a side view;

FIG. 4 is a back view;

FIG. 5 is a side view showing the side opposite the side shown in FIG. 3; and,

FIG. 6 is a bottom view.

The broken line showings of digital clock face portions are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for an alarm clock, as shown. 